Hello, everyone! Yesterday I was playing/tuning with my Odoo, PostgreSQL, and Linux Kernel. But, the result is not like I expected. Often get 502 Bad Gateway nginx. Can someone help me through this?

My Spec:

8CPU

32 GB RAM

400 GB 

400 GB NVMe Disk Space

Here's my configuration:

Nginx sites enabled:

#odoo server

upstream odoo {

server 127.0.0.1:8069;

}

upstream odoochat {

server 127.0.0.1:8072;

}

server {

listen 80;

server_name (my IP address);

proxy_read_timeout 720s;

proxy_connect_timeout 720s;

proxy_send_timeout 720s;

# Add Headers for odoo proxy mode

proxy_set_header Host $host;

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

proxy_set_header X-Forwarded-Proto $scheme;

proxy_set_header X-Real-IP $remote_addr;

# log

access_log /var/log/nginx/odoo\.access\.log;

error_log\ /var/log/nginx/odoo.error.log;

# Redirect requests to odoo backend server

location / {

proxy_redirect off;

proxy_pass http://odoo;

}

location /longpolling {

proxy_pass http://odoochat;

}

# common gzip

gzip_types text/css text/less text/plain text/xml application/xml application/json application/javascript;

gzip on;

client_body_in_file_only clean;

client_body_buffer_size 32K;

client_max_body_size 500M;

sendfile on;

send_timeout 600s;

keepalive_timeout 300;

}

Odoo.conf:

admin_passwd = -

db_host = localhost

db_name = False

db_password = -

db_port = 5432

db_sslmode = prefer

db_template = template0

db_user = limomoli

http_port = 8069

logfile = /var/log/limomoli/limomoli-server.log

addons_path=/limomoli/limomoli-server/addons,/limomoli/custom/addons

proxy mode = True

workers = 15

limit_memory_hard = 15360000000

limit_memory_soft = 12288000000

max_cron_threads = 2

limit_request = 8192

limit_time_cpu = 600

limit_time_real = 1200

log_level = debug_rpc

PostgreSQL conf:

max_connections = 100

shared_buffers = 15GB

effective_cache_size = 24GB

maintenance_work_mem = 2GB

checkpoint_completion_target = 0.9

wal_buffers = 16MB

default_statistics_target = 100

random_page_cost = 1.1

effective_io_concurrency = 200

work_mem = 20971kB

huge_pages = on

min_wal_size = 1GB

max_wal_size = 4GB

max_worker_processes = 8

max_parallel_workers_per_gather = 4

max_parallel_workers = 8

max_parallel_maintenance_workers = 4

synchronous_commit = off

Linux Kernel:

vm.nr_hugepages=7889

vm.swappiness=1

vm.overcommit_memory=2

vm.dirty_background_ratio=5

Really appreciate every help, thank you!